I did double check today and there are none.
I don't know your tractor, does it have Power Beyond? IF it does, just add a single spool after the FEL, mount it next to it. Like this one: 1 Spool 8 GPM Prince MB11B5C1 DA Valve
Just a thought but what about just replacing the 2 spool FEL control with 3 spools?
Something like this: HYDRAULIC LOADER VALVE 3 SPOOL W/JOYSTICK 10 GPM W/FLOAT SPOOL | eBay
You can use the old 2 spool for Top-N-Tilt control if you add that later (or just sell it).
Or you can get a kit. The WR Long 3rd function kit is well regarded and costs about $850.